It is not contradictory. Put another way: The presence or not of something in reality is indisputable. Therefore the not presence of everything is possible.

non-existence exists is contradictory.

Refer to Principia Mathematica, Cambridge, pages 116–117

I remain in disagreement. Absence of everything is a logically consistent idea. 'Empty space' as we call it is actually something and it originated in the Big Bang. How else do you explain dark energy?

I am not saying absence of everything has every existed in totality; there has always been something in our universe (but maybe there are null universes out there somewhere). I just saying absence of everything could co-exist with something; IE our expanding universe.

I am not saying absence of everything has every existed in totality; there has always been something in our universe (but maybe there are null universes out there somewhere). I just saying absence of everything could co-exist with something; IE our expanding universe.

If you don't buy the argument that logic and all language is a representation of existence, not existence itself - it's rather moot.

Logic is simply a human effort to describe how reality behaves.
Logic is built upon one simple pre-supposition: Reality behaves and adheres to some set of basic and universal rules.

If this pre-supposition is false and reality is intrinsically chaotic then logic is useless.